#region License
//
// Author: Nate Kohari <nkohari@gmail.com>
// Copyright (c) 2007-2008, Enkari, Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion
#region Using Directives
using System;
using Ninject.Core;
using Ninject.Core.Activation;
#endregion

namespace Ninject.Framework.Web
{
	/// <summary>
	/// A static container for the <see cref="NinjectHttpApplication"/>'s kernel.
	/// </summary>
	internal static class KernelContainer
	{
		/*----------------------------------------------------------------------------------------*/
		#region Fields
		private static IKernel _kernel;
		#endregion
		/*----------------------------------------------------------------------------------------*/
		#region Properties
		/// <summary>
		/// Gets or sets the kernel that is used in the application.
		/// </summary>
		public static IKernel Kernel
		{
			get { return _kernel; }
			set
			{
				if (_kernel != null)
					throw new NotSupportedException("The static container already has a kernel associated with it!");

				_kernel = value;
			}
		}
		#endregion
		/*----------------------------------------------------------------------------------------*/
		#region Public Methods
		/// <summary>
		/// Injects the specified instance by using the container's kernel.
		/// </summary>
		/// <param name="instance">The instance to inject.</param>
		public static void Inject(object instance)
		{
			if (_kernel == null)
			{
				throw new InvalidOperationException(String.Format(
					"The type {0} requested an injection, but no kernel has been registered for the web application.\r\n" +
					"Please ensure that your project defines a NinjectHttpApplication.",
					instance.GetType()));
			}

			_kernel.Inject(instance);
		}
		#endregion
		/*----------------------------------------------------------------------------------------*/
	}
}